Nobsound Mini Bluetooth 5.0 Power Amplifier, Stereo Hi-Fi Digital Amp 2.0 Channel 50W×2 with AUX/USB/Bluetooth Input, Wireless Audio Receiver, PC Sound Card with Power Supply (Black)
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AI Verdict
A shockingly tiny amp that delivers clean sound for a desktop or small room setup, making it a go-to for reviving old passive speakers on a tight budget.
This amp is a strong fit if your goal is a cheap, tiny, and flexible way to power small speakers on a desk. The inclusion of USB, AUX, and Bluetooth covers all the bases for a simple setup. However, the widely reported Bluetooth hiss and optimistic power ratings make it a weak fit for anyone sensitive to noise or trying to fill a large space with sound.
If you need cleaner power for more demanding speakers, look for a Class A/B amplifier or a Class D amp with a stated Signal-to-Noise Ratio (SNR) above 100dB.
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Pros
- Extremely compact all-metal case can be held in one hand.
- Includes AUX, USB, and Bluetooth 5.0 inputs for versatile connections.
- USB input functions as a PC sound card with no driver installation required.
- Comes with a 19V power supply and all necessary cables for out-of-the-box use.
- Powers small bookshelf speakers surprisingly well for near-field listening.
Cons
- A noticeable hiss or static is often reported when using Bluetooth with no audio playing.
- The 50W per channel power rating is optimistic; it distorts at high volumes.
- Speaker wire terminals are small, making it difficult to connect thicker gauge wire.
- The blue Bluetooth indicator LED is distractingly bright in dark rooms.
- Lacks a remote control for volume or input switching.
Dimension Scores
It provides surprisingly clear sound for its price, but is held back by common reports of background hiss and distortion at higher volumes.
The 50W x 2 rating is generous; it gets loud enough for a desktop but lacks the headroom for deep bass or filling a medium-sized room.
Offering Bluetooth 5.0, driverless USB audio, and AUX inputs is excellent versatility for a device in this price band.
The all-metal aluminum chassis is incredibly compact and feels durable, making it perfect for tight spaces.
Best For
- Powering passive bookshelf speakers (4-8 ohm) for a desktop computer.
- Creating a compact, simple stereo system in a bedroom, dorm, or office.
- Reviving a pair of old, unpowered speakers for casual listening.
- A first-time project for someone building a budget audio setup.
Not Recommended For
- Driving large, inefficient, or floor-standing speakers.
- Critical audiophile listening where zero background noise is required.
- Powering a primary living room home theater system.
Watch Out For
- The blue LED indicator for Bluetooth is so bright that many users resort to covering it with electrical tape.
- A loud 'pop' noise often comes through the speakers when the unit is powered on or off.
- Bluetooth has input priority, meaning it will automatically disconnect your AUX or USB source if a previously paired phone or device comes into range.
- Some users report the amp randomly muting or cutting out for a few seconds when pushed to high volumes, possibly due to overheating or the power supply being overwhelmed.
Full Specifications
| ASIN | B06Y67PZB1 |
| Brand | Douk Audio |
| Voltage | 12 Volts (DC) |
| Material | Aluminum |
| Item Weight | 15.5 ounces |
| Manufacturer | Nobsound |
| Output Power | 100 Watts |
| Mounting Type | Surface Mount |
| Supply Current | 5 Amps |
| Item model number | GFJ058NEW |
| Package Type Name | Box |
| Specification Met | CE, FCC |
| Number of Channels | 2 |
| Product Dimensions | 2.76 x 3.07 x 1.5 inches |
| Operating Temperature | 10 Degrees Celsius |
| Maximum Supply Voltage | 24 Volts (DC) |
| Minimum Supply Voltage | 9 Volts (DC) |
| Item dimensions L x W x H | 2.76 x 3.07 x 1.5 inches |
| Is Discontinued By Manufacturer | No |
What Buyers Say
The most common reaction to this amp is surprise at how much sound comes out of such a tiny metal box. It's become a go-to solution for powering desktop speakers or giving life to old passive speakers that were collecting dust. The variety of inputs—Bluetooth, USB, and AUX—is a huge plus for the price. However, the Bluetooth connection is a double-edged sword; while convenient, it's the source of the most frequent complaint: a persistent background hiss when music isn't playing. Another recurring annoyance is the piercingly bright blue LED light, which most owners end up covering with a piece of tape.
“i literally just wanted to use my dad's old bookshelf speakers with my computer and this little thing is perfect, it gets plenty loud for my room and sounds a million times better than a crappy soundbar, just had to put tape over the crazy bright blue light.”
Common Praise
- Drives my small bookshelf speakers with impressive clarity and volume for my desk setup.
- The solid aluminum case feels premium and durable, not like cheap plastic.
- Plug-and-play USB connection to a computer works instantly without needing any drivers.
- Bluetooth pairing is fast and the connection is stable within a single room.
- Incredibly small footprint saves a ton of desk space compared to traditional receivers.
Common Complaints
- A constant, low-level hiss is audible through the speakers on the Bluetooth input when idle.
- The blue status LED is way too bright for a dark room.
- Makes a loud 'pop' through the speakers when powered on or off.
- Speaker terminals are tiny and can be a pain to use with anything but thin speaker wire.
- Sound gets distorted and grainy when the volume knob is pushed past about 75%.
Ownership Tips
- You quickly learn to turn the volume knob all the way down before powering the amp on to avoid the startling speaker pop.
- If you use multiple inputs, you'll find yourself disabling Bluetooth on your phone just to keep the amp from automatically switching away from your computer's USB audio.
- The volume knob isn't very linear; most of the usable volume range is between the 9 o'clock and 3 o'clock positions.
- The amp's small metal body acts as a heatsink and can get quite warm after a couple of hours of playback at a decent volume.
- The included 19V power supply is adequate, but some users who experiment with different power supplies report cleaner sound or better performance under load.
Frequently Asked Questions
Can this power large floor-standing speakers?
No, it's not recommended. This amp is designed for smaller, efficient bookshelf or desktop speakers, typically with a 4 to 8-ohm rating.
Is there a hiss or hum when no music is playing?
Many users report a noticeable hiss, especially when connected via Bluetooth. This is a common issue with budget amplifiers in this class.
Can I connect a subwoofer to this amp?
No, this is a 2.0 channel stereo amplifier and does not have a dedicated subwoofer output.
Does it get hot?
It can get warm to the touch during extended use at high volumes, but users report it doesn't typically get alarmingly hot.
Does it remember the last input I used?
No, it tends to prioritize Bluetooth. If a paired device is in range, it will often switch to that input automatically.
Is the 100W (50W x 2) power rating accurate?
The 50W per channel rating is a peak value. Real-world continuous power is much lower, and users report distortion when pushing the volume to its maximum.
Can I leave it on all the time?
Yes, it consumes very little power at idle. However, be aware of the potential for a constant low-level hiss and the 'pop' sound when you do turn it off and on.
Buying Guide
You're looking at a mini-engine for passive speakers—the kind that only have speaker wire connections. This little box takes a signal from your phone, computer, or TV and makes it loud. Don't get hung up on the '100W' marketing; its real strength is providing a huge upgrade over built-in TV speakers or basic PC speakers for a very low price. It's for a simple, small-scale setup, not a block party.
50W x 2
This means it can power two speakers for stereo sound. Think of the 50 watts as a 'peak' number, like a car's top speed. It's more comfortable cruising at a lower power, which is perfect for listening at your desk but won't shake the house.
Bluetooth 5.0 / USB / AUX
This is all about options. Bluetooth is for easy wireless streaming from your phone. USB is often the best way to connect to a computer, turning the amp into an external sound card for cleaner audio. AUX is the universal headphone-style jack for everything else.
Class D Amplifier
This is why the amp is so small and doesn't get scorching hot. Class D amps are very efficient, turning more electricity into sound and less into wasted heat. While high-end versions are amazing, budget ones can sometimes have more background noise or hiss.
Alternatives
If this amp seems too basic, look for models that specifically mention a 'subwoofer out' or 'sub out' if you want to add a sub. For better sound quality, search for amplifiers that list a high Signal-to-Noise Ratio (SNR), like 100dB or more, which indicates less background hiss.
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